I just did a bunch of Google searches of people overclocking 3570k's with the Asrock z75 motherboard and it seems that as long as you have adequate cooling and a decent chip, you should be able to get your 3570k running stable at 4.5GHz.

Here is an example of someone with the 3570k overclocked to 4.5GHz with the Asrock Z75 Pro3 motherboard.

4.5GHz CPU-Z Validation
4.3GHZ CPU-Z Validation
Check the vcore's on those validations too. That all depends on how well your chip clocks though so don't expect for the exact same vcore to work for you. But who knows maybe your 3570k will be really good clocker and need less voltage.

So if you will only ever use one GPU and don't plan to push your overclock extremely high then the Asrock Z75 Pro3 will work. If you will be happy with 4.2-4.5GHz overclock and only ever 1 GPU then the Asrock Z75 Pro3 would work.

EDIT: Just saw you aren't dead set on just Asrock. I use Gigabyte motherboards a lot and they work great and overclock decently. I run my 3570k at 4.5GHz 24/7 with 1.176v vcore with a Gigabyte Z68X-UD3H-B3. I also have a Gigabyte Z77X-UD3H and it will run a 3570k at 4.5GHz as well(haven't had the time to try pushing further than 4.5GHz on either motherboard yet).Edited by Dark Volker - 7/12/14 at 6:23pm

I just did a bunch of Google searches of people overclocking 3570k's with the Asrock z75 motherboard and it seems that as long as you have adequate cooling and a decent chip, you should be able to get your 3570k running stable at 4.5GHz.

Here is an example of someone with the 3570k overclocked to 4.5GHz with the Asrock Z75 Pro3 motherboard.

4.5GHz CPU-Z Validation
4.3GHZ CPU-Z Validation
Check the vcore's on those validations too. That all depends on how well your chip clocks though so don't expect for the exact same vcore to work for you. But who knows maybe your 3570k will be really good clocker and need less voltage.

So if you will only ever use one GPU and don't plan to push your overclock extremely high then the Asrock Z75 Pro3 will work. If you will be happy with 4.2-4.5GHz overclock and only ever 1 GPU then the Asrock Z75 Pro3 would work.

1GHz overclock is not much. That's 4.4Ghz which can be done on almost everything, but even then I would personally not get the chepo boards if there are plans to run that CPU 24/7 at those clocks. If you want to get near 4.5Ghz+ and have 24/7 stability, then look for more decent boards like Z77X-D3H, Z77A-GD55, P8Z77-V, ASRock Z77 Extreme6, Z77XE3 or 4.

Get a Z77, if you can afford the Z77, why bother getting something lower. A PC is an investment that you will definitely get your money's worth. Imagine, how much time do you spend on the PC? How much time have you wasted because your parts are slow? It all adds up and $100 is nothing compared to how much time you actually spend on the PC. And plus, Z77 does overclock better than a Z75. Some people will say it doesn't, but motherboard plays a big factor in overclocking as well as being lucky with the CPU.

I was just saying that you don't need a Z77 motherboard for overclocking. I'm not saying yes, get the Z75, you will love it and it will be an overclocking monster. I'm just saying that the Z75 should give you at least 4.2-4.3GHz if you have a decent chip and cooling and you might get 4.5GHz+ too if you get a good 3570k. It is kinda luck of the draw when it comes to the CPU's. I was just lucky enough that mine will do 4.3GHz at 1.08v and 4.5GHz at 1.176v.

If you can afford the Z77 though...then get it. If you can't afford it, the Z75 will overclock too or even a Z68.Edited by Dark Volker - 7/12/14 at 6:30pm